Answers
Answer: Sr
Explanation: Strontium electron configuration is [Kr] 5s2. It belongs to group 2 and period 5 of the periodic table.
The element that has a valence configuration of 5s² is Strontium i.e. Sr. Hence option d is correct.
What is valence configuration?Valence configuration is defined as the amount of electrons an atom must earn or lose to reach the electrical configuration of the nearby noble gas or inert gas .Valence electrons are the electrons that make up an atom's top energy level or outermost shell. Use the symbol for the closest preceding noble gas to represent the filled inner shells of each element, and then use superscripts to specify the primary quantum number of its valence shell, its valence orbitals, and the number of valence electrons in each orbital.
Strontium has atomic number 38 and electronic configuration [Kr] 5s². the electronic configuration of strontium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s².
Thus, the element that has a valence configuration of 5s² is Strontium i.e. Sr. Hence option d is correct.
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Related Questions
An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands' Law of Octaves would hold true?
Answers
which is the graph of the function g(x) = f(-x)
Answers
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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What is the mass of a rectangular piece of copper 24.4cm x 11.4 cm x 7.9 cm? The density of copper is 8.92g/cm3.
Answers
The mass of the rectangular piece of copper is 18,869 g (approx).In conclusion, the mass of a rectangular piece of copper with dimensions 24.4cm x 11.4 cm x 7.9 cm and a density of 8.92 g/cm³ is 18,869 g (approx.).
The given dimensions of the rectangular piece of copper are:Length = 24.4 cmWidth = 11.4 cmHeight = 7.9 cmThe formula to calculate the mass of an object is given by;
Mass = Density x Volume
Here, the density of copper is given as 8.92 g/cm³.
Therefore, the first step is to calculate the volume of the rectangular piece of copper.The formula to calculate the volume of a rectangular object is given by:
Volume = Length x Width x Height
So,Volume = 24.4 cm x 11.4 cm x 7.9 cm= 2115.432 cm³Now we will use the mass formula:
Mass = Density x Volume= 8.92 g/cm³ x 2115.432 cm³= 18,869.27824 g= 18,869 g (approx.)
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According to the Arrhenius equation, changing which factors will affect the
rate constant?
OA. The constant A and the temperature
B. Temperature and activation energy
C. Temperature and the ideal gas constant
D. The activation energy and the constant A
SUBMIT
Answers
The correct answer is B: Temperature and activation energy are the factors that affect the rate constant according to the Arrhenius equation.
According to the Arrhenius equation, which describes the relationship between the rate constant (k) of a chemical reaction and temperature, changing the factors of temperature and activation energy will affect the rate constant.
The Arrhenius equation is given by:
k = A * e^(-Ea/RT),
where k is the rate constant, A is the pre-exponential factor or the frequency factor, Ea is the activation energy, R is the ideal gas constant, T is the temperature in Kelvin, and e is the base of the natural logarithm.
From the equation, it is evident that the rate constant is directly influenced by temperature and activation energy. Increasing the temperature results in a higher rate constant, as the exponential term in the equation becomes larger. This is because higher temperatures provide more kinetic energy to the reacting molecules, leading to more frequent successful collisions and increased reaction rates.
Similarly, the activation energy affects the rate constant. A higher activation energy results in a lower rate constant, as the exponential term becomes smaller. Activation energy represents the energy barrier that reactant molecules must overcome to form products. A higher activation energy implies a slower reaction rate. option(B)
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please help me with these
Answers
1) Diesel has a higher viscosity than petrol.
2) Petrol is more flammable than diesel.
3) The formula will be C₁₀H₂₂.
4) The equation is; 2C8H18+25O2→16CO2+18H2O.
What is the hydrocarbon?Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.
Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.
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How much heat is required to increase the temperature of 150 g of water from
38°C -55°C?
Answers
Answer:
-55°C
Explanation:
Bwcause 38°C is gonna make it colder so thats why you should use that.
What does a compound do in a chemical reaction?
Answers
Answer:Compounds are chemical substances that contain more than one element. They're created during a chemical reaction where atoms are rearranged into new compound molecules. For example, if carbon atoms react with oxygen atoms they form carbon dioxide molecules.
Explanation:
Describe how to test your unknown salt mixture for the presence of
Na3PO4.12H2O.
Answers
Na3PO4*12H2O + BaCl2*2H2O = Ba3(PO4)2 + NaCl + H2O
add barium chloride to your Na3PO4.12H2O a white precipitate of Ba3(PO4)2 will be formed wrt salt(NaCl) and water(H20) if Na3PO4.12H2O. will be there.
If you have 32.0 g pure baking soda in a decomposition reaction what is the theroetical yield of sodium carbonate
Answers
Answer:
i dont know
Explanation:
The reaction of nitrogen and hydrogen to make ammonia is important because it provides fertilizer for growing food, and is because ammonia is needed to make other nitrogen-containing compounds. At room temperature, ∆G° and ∆H° for the reaction are both negative.
N2(g) + 3 H2(g) --> 2 NH3(g)
Which two of the following statements about this reaction are true?
- Adding an appropriate catalyst makes the reaction more spontaneous
- Increasing the temperature lowers the activation energy of the reaction
- Increasing the temperature makes the reaction less spontaneous
- The entropy change for the reaction is positive
- Increasing the pressure makes the reaction more spontaneous
Answers
The two statements that are true about the reaction are:
Adding an appropriate catalyst makes the reaction more spontaneous Increasing the temperature lowers the activation energy of the reactionWhat is a catalyst?A catalyst is described as a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
If we happen to increase the temperature, it provides more kinetic energy to the reactant molecules and this makes it more likely to overcome the activation energy barrier and engage in the reaction.
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The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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1. Which substance is reduced in this redox reaction?
CuO(s) + H₂(g) → Cu(s) + H₂O(l)
A. H₂
B. Cu
C. H₂0
D. o
Answers
Answer:
B.Cu
Explanation:
n the reaction H2 is oxdized since it has lost electrons and Cu is reduced since it has gained electrons
Based on a Kc value of 0.250 and the given data table, what are the equilibrium concentrations of XY, X, and Y , respectively?
Answers
From the solution that we have in the question;
The concentration of X and Y is 0.28 MThe concentration of XY is 0.32 MWhat is the equilibrium constant?The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.
It is a fundamental concept in chemical equilibrium.
The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.
Kc = [X] [Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\)
\(0.25(0.5 - x) = (0.1 + x)^2\)
\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)
x = 0.18 M
The equilibrium amount of X and Y= 0.28 M and the equilibrium concentration of XY = 0.32 M
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Based on the answer to the question that we have;
A 0.28 M concentration of X and Y exists at equilibriumXY's concentration at equilibrium is 0.32 M.The equilibrium constantThe ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.
It is a cornerstone of the theory of chemical equilibrium.
A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.
Kc = [X][Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)
The equilibrium concentration of;
XY =0.5 - 0.18
=0.32 M
Then the equilibrium amount of
X and Y is
0.1 + 0.18= 0.28 M.
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A reaction vessel contains 4.800 g of CO and 4.800 g of O2. What is the maximum number of moles of CO2 recovered, based on the number of moles of the given reactants?
Answers
The maximum number of moles of \(CO_2\) that can be recovered from the reaction vessel would be 0.17 moles.
Stoichiometric calculationThe reaction vessel contains:
4.800 g CO4.800 g \(O_2\)The equation of the reaction would be as follows:
\(2CO + O_2 --- > 2CO_2\)
The mole ratios of the reactants to the product are as follows:
CO to \(CO_2\) = 1:1\(O_2\) to \(CO_2\) = 1:24.800 g of CO = 4.8/28
= 0.17 moles
4.800 g of \(O_2\) = 4.8/32
= 0.15 moles
Since the mole ratio of CO to \(O_2\) is 2 to 1, 0.17 of CO is limiting.
The mole ratio of CO to \(CO_2\) is 1 to 1. Thus, the equivalent mole of \(CO_2\) that can be recovered is also 0.17.
In other words, the maximum number of moles of \(CO_2\) that can be recovered from the reaction vessel is 0.17 moles.
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A burning match will burn more vigorously in pure oxygen than in air because _________ . Select one: a. oxygen is a catalyst for combustion b. nitrogen is a reactant in combustion and its low concentration in pure oxygen catalyzes the combustion c. oxygen is a product of combustion d. nitrogen is a product of combustion and the system reaches equilibrium at a lower temperature e. oxygen is a reactant in combustion and pure oxygen increases the reactant concentration
Answers
Answer:
e. oxygen is a reactant in combustion and pure oxygen increases the reactant concentration
Explanation:
The reaction of a burning match is combustion. In this combustion, the organic components of the match (such as cellulose, C₆H₁₀O₅) react with oxygen, producing water and carbon dioxide:
C₆H₁₀O₅(s) + 6O₂(g) → 5H₂O(g) + 6CO₂(g)Seeing as oxygen is a reactant and not a catalyst nor product, and that nitrogen plays no part in the reaction, the only correct answer is option e.
Explain why Statutes coated with white lead on long exposure to atmosphere
turn black and the original colour can be restored on treatment
with H2O2.
Answers
Answer:
Its because once you go black, there's no going back
Explanation:
turn black and the original colour can be restored on treatment
with H2O2.
Long exposure to atmosphere converts white lead into black PbS due to H2S present in the atmosphere. As a result, statues turn black. On treatment with H2O2, the black PbS get oxidized to white PbSO4 and the colour is restored. Hydrogen peroxide is just one oxygen atom different from Water.
*You have a 1.2 M solution of CaCi, that has a final volume of 0.050 L a.
How many moles of CaCly are generated in the reaction?
b.
How many grams of CaCly are generated in the reaction?
Answers
The number of moles is 0.06 moles while the mass is 6.66 g
What is the mole?The mole is a unit of measurement used in chemistry to express amounts of a substance. One mole of a substance is defined as the amount of that substance that contains as many entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12, which is a common isotope of carbon.
Number of moles = 1.2 * 0.05
= 0.06 moles
Mass of the CaCl2 = 0.06 moles * 111 g
= 6.66 g
The mole is used to make it easier to compare the amounts of different substances in chemical reactions, and to calculate the amounts of reactants needed to produce a certain amount of product.
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An experiment requires 65.00 g of sodium chloride. Sodium chloride is available at a price of $179.0 per 5.000 kg sodium chloride. What is the cost of the sodium chloride in the experiment (reported to the hundredths place because we're working with dollars)?
Answers
Answer: on
Explanation:5
The price of sodium chloride per 5 kg is 179 dollars. The experiment requires 65 g of NaCl. The price of65 g or 0.065 kg is 2.3 dollars.
What is sodium chloride?Sodium chloride is an ionic compound formed by the combination of sodium metal and chlorine atom. Sodium metal has extra one electron in its valance shell and chlorine needs one more electron into its valence shell. Hence sodium donates its valence electron to chlorine forming NaCl.
NaCl is used as the table salt in food. It is a very important compound in our daily diet. Similarly NaCl is industrially important for many reaction especially in electrochemical processes.
It is given that, the price of 5 kg of NaCl = $179
required mass of NaCl = 65 g = 0.065 Kg
then , price of 0.065 kg = (0.065 × 179 /5) = $2.31
Therefore, the cost of NaCl in the experiment is 2.31 dollars.
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1) The bulb of thermometer is filled with _________ .
2) A ______ waves consists of crests and_______.
3) Magnet was discovered by ___________.
4) The saturated solution prepared at a high temperature is called __________.
5) Horse is ______ blooded animal.
Answers
Answer:
Mercury
Crests and troughs
shepherd
supersaturated
Warm
A burning match releases 838.2 J of energy. Convert the energy released by 20 matches to the following energy units: (provide an answer in 4 significant figures)
________ Kilojoules
________ Calories
________ Food Calories
________ calories
________ kcal
Answers
Answer:
See explanation
Explanation:
In this case, we can start with the calculation of the total energy released by the 20 matches. One match release 838.2 J of energy ( 1 match = 838.2 J). So:
\(20~matches\frac{838.2~J}{1~match}=16764~J\)
With this in mind, we have to find al the conversion ratios to "Jolues", so:
\(1~KJ=1000~J\)
\(1~Cal=4.184~J\)
\(1~KCal=4184~J\)
\(0.000239~food~calories=1~J\)
Now, we can do the conversions:
\(16764~J\frac{1~KJ}{1000~J}=16.76~KJ\)
\(16764~J\frac{1~Cal}{4.184~J}=4.005x10^3~Cal\)
\(16764~J\frac{1~KCal}{4184~J}=4.007~KCal\)
\(16764~J\frac{0.000239~food calories}{1~J}=4.006~food calories\)
I hope it helps!
Baking soda (NaHCO3) and vinegar (HC2H3O2) react to form sodium acetate, water, and carbon dioxide. If 42.00 g of baking soda react, how many moles of carbon dioxide will form? Show your work. (3 points)
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO
Answers
Answer:
0.5 mole of CO₂.
Explanation:
We'll begin by calculating the number of mole in 42 g of baking soda (NaHCO₃). This can be obtained as follow:
Mass of NaHCO₃ = 42 g
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3)
= 23 + 1 + 12 + 48
= 84 g/mol
Mole of NaHCO₃ =?
Mole = mass / molar mass
Mole of NaHCO₃ = 42/84
Mole of NaHCO₃ = 0.5 mole
Next, balanced equation for the reaction. This is given below:
NaHCO₃ + HC₂H₃O₂ → NaC₂H₃O₂ + H₂O + CO₂
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of CO₂
Finally, we shall determine the number of mole of CO₂ produced by the reaction of 42 g (i.e 0.5 mole) of NaHCO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of CO₂.
Therefore, 0.5 mole of NaHCO₃ will also react to produce 0.5 mole of CO₂.
Thus, 0.5 mole of CO₂ was obtained from the reaction.
Which element has chemical properties most similar to sodium? a. magnesium b. oxygen c. phosphorus d. rubidium
Answers
The element that has chemical properties most similar to sodium is d. rubidium.
What is rubidium?
Rubidium is in the same group (group 1) as sodium in the periodic table and has similar chemical properties, such as reactivity with water and the tendency to form ionic compounds with halogens. Magnesium, oxygen, and phosphorus are not in the same group as sodium and have different chemical properties.
What is periodic table?
The periodic table is a tabular display of all known chemical elements, arranged according to their atomic structure and properties. It is arranged in rows and columns, with elements placed in order of increasing atomic number, which is the number of protons in an atom's nucleus. The periodic table is a powerful tool for predicting the chemical behavior of elements and for understanding the relationships between different elements. It is used extensively in chemistry, physics, and other sciences to help understand the properties and behavior of different elements, and to guide research and development in many different fields.
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HELPPPPP (100 POINTS)
Assume that the water stream is replaced by a stream of CCl4. Predict what would happen in each case.
a. charged acetate strip:
b. charged vinyl strip:
c. Explain your predictions.
Answers
Answer:c
Explanation:c
How do chemicals affect our lives? O A. Chemicals have made our lives much harder. B. Chemicals make our daily lives more dangerous. O C. Chemicals have made it possible for us to own less. O D. Chemicals have made many things easier.
Answers
Answer:
the answer is d
Answer:
D
Explanation:
Because they are many different types of chemicals some are dangerous but some are applicable to use . chemicals help to wash germs away so we can live in a healthy environment.
Which amphibian organ has a high blood supply and many folds to increase surface area?
a. heart
b. stomach
c. lungs
d. brain
Answers
Answer:
lungs
Explanation:
Of the following regions of the electromagnetic spectrum, which one has the shortest wavelength?
a.
gamma rays
b.
infrared
c.
radio waves
d.
X rays
e.
microwaves
f.
ultraviolet
Answers
Answer:
A ---->gamma ray
Explanation:
Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.
Determine the volume of hydrogen gas needed to react completely with
5.00 L of oxygen gas to form water,
Answers
The volume of hydrogen needed to react with 5.00 L of oxygen based on the mole ratio is 10.00 L.
What volume of hydrogen gas is needed to react with 5.00 L of oxygen?The volume of hydrogen gas is needed to react with 5.00 L of oxygen is determined from the mole ratio of the reactants as shown in the equation of reaction below:
Equation of reaction: 2 H₂ + O₂ → 2 H₂O
Mole ratio of hydrogen to oxygen = 2 : 1
Moles of gases occupies equal volume
Therefore, Volume ratio of hydrogen to Oxygen = 2 : 1
Volume of hydrogen needed to react with 5.00 L of oxygen = 5.00 * 2
Volume of hydrogen needed to react with 5.00 L of oxygen = 10.00 L
In conclusion, the volume of hydrogen required is obtained from the mole ratio of hydrogen and oxygen in the reaction.
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If you were to combine two carbon-12 atoms in a fusion process, what element would you get?.
Answers
The element would you get is Mg. 6C12 + 6C12 1 11Na24 + +1e0.
The first step in making carbon is to fuse the nuclei of hydrogen the lightest element to make helium the second lightest element. The next step is to fuse the two helium 4 nuclei. Each contains two protons and two neutrons. Forms beryllium-8. This takes in another helium and produces carbon-12.
The main problem in the carbon cycle is proton addition but after a carbon-12 nucleus fuses with a proton to form nitrogen-13 one of the protons decays to carbon-13 emitting a positron and a neutrino. Two more proton captures produce nitrogen-14 and then oxygen-15. Stellar Fusion Reactors In massive stars hydrogen burns to form helium. This produces carbon which can be further processed into oxygen and heavier elements.
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A sample of helium occupies 12.0 L at a pressure of 25.0 atm. What volume would the helium gas occupy at a pressure of 1.00 atm?
Answers
Volume would the helium gas occupy at a pressure of 1.00 atm is 2.08 Liters by using Charle's law.
Helium is a safe, non-flammable gas that is frequently used to fill balloons for festivals and parades. Helium, however, is a crucial component in a variety of industries, including high technology, science, and even national security.
According to Charle's Law: V1 / T1 = V2 / T2, the volume that helium gas would occupy at a pressure of 1.00 atm
V1/T1=V2/T2
12/25=V2/1
V2=2.08 L
Everything is conceivable. Pure helium inhaling causes the body to lose oxygen as if you were holding your breath. If you were unable to breathe at all, your body would run out of blood-stored oxygen within minutes, and you would start to lose consciousness.
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7. What is the volume of the
composite
solid?
4 in.
3 in.
3 in.
Answers
Answer:
The volume of Component 1 is 36 cubic inches.
Explanation:
To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.
In this case, the composite solid consists of multiple components with the following dimensions:
Component 1:
Length: 4 inches
Width: 3 inches
Height: 3 inches
To find the volume of Component 1, we multiply the length, width, and height together:
Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches
Therefore, the volume of Component 1 is 36 cubic inches.
Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.